The current study uses phonon wave-packet simulations and calculates the phonon transmission rate to explore the contributions of the mass and the bond energy differences on the thermal boundary conductance at the interface between two dissimilar materials. The impact of interdiffusion and interface bond strength on the thermal boundary conductance are also studied. Results show that the difference in mass and bond energy of materials results in a difference in phonon dispersion relations. Thus the frequency dependence of phonon transmission rate is observed at the interface. The interdiffusion allows high frequency phonons to contribute to phonon energy transport by inelastically scattering into multiple lower frequency phonons. Therefore the different energy distribution at the interface is observed for different wavevectors when there is interdiffusion between two materials which results in increased strain at the interface. It is also found that applying different bond strengths has little effect on thermal boundary conductance at the interface unless this interface bond strength deviates significantly from the commonly used mixing rules.
- Heat Transfer Division
Prediction of Thermal Boundary Conductance at the Interface With Phonon Wave-Packet Simulations: The Roles of Vibrational Spectra Differences, Interface Bond Strength, and Inelastic Scattering
- Views Icon Views
- Share Icon Share
- Search Site
Choi, C, Yorgason, WT, & Roberts, NA. "Prediction of Thermal Boundary Conductance at the Interface With Phonon Wave-Packet Simulations: The Roles of Vibrational Spectra Differences, Interface Bond Strength, and Inelastic Scattering." Proceedings of the ASME 2016 Heat Transfer Summer Conference collocated with the ASME 2016 Fluids Engineering Division Summer Meeting and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. Volume 1: Heat Transfer in Energy Systems; Thermophysical Properties; Theory and Fundamentals in Heat Transfer; Nanoscale Thermal Transport; Heat Transfer in Equipment; Heat Transfer in Fire and Combustion; Transport Processes in Fuel Cells and Heat Pipes; Boiling and Condensation in Macro, Micro and Nanosystems. Washington, DC, USA. July 10–14, 2016. V001T02A003. ASME. https://doi.org/10.1115/HT2016-7177
Download citation file: